Question

In fruit flies, the gene for red eyes (R) is dominant and the gene for sepia eyes (r) is recessive. If a red-eyed heterozygous fly (Rr) mates with a sepia-eyed homozygous fly (rr), what are the possible genotypes of their offspring? (Hint: You many want to complete a Punnett square.)

Rr only
RR, Rr, and rr
Rr and rr
RR and Rr

Answer 1

Rr and rr

Step-by-step explanation:

i took the class

Answer 2

Complete a Punnett Square to see the possible offspring.

. R I r
-------------
r I Rr I rr I
--------------
r I Rr I rr I
--------------
Excuse the horrible square, but as you can see, the possible genotypes will be Rr and rr.